The slope-sliding of Union Valley Open Pit Mine began at the mine development stage.
团结沟露天矿从基建时起即开始滑坡。
Relative economic values, mining risk and characteristics of mineral resources are presented. Suggestions on mine development policies are put forward.
介绍了矿产资源开采经济价值的相对性，开发的风险性与特点。对矿业开发政策提出了建议。
The total value of resources in Dulong mine area is analysed and calculated so as to offer useful information for reference in mine development and decision making.
阐述了矿产资源总价值的概念和构成，分析和计算了矿区资源总价值，为开发研究和决策提供参考。
Mine development system is not unchangeable.
矿井开拓系统不是一成不变的。
In the Gudan mining district of Siding Lead-Zinc Mine, development has been carried out through driftway.
泗 顶铅锌矿的古丹矿区采用平窿开拓，其最低开拓中段以下尚赋存有规模不大的矿体。
In the Gudan mining district of Siding Lead-Zinc Mine, development has been carried out through driftway.
泗 顶铅锌矿的古丹矿区采用平窿开拓，其最低开拓中段以下尚赋存有规模不大的矿体。
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